SAGE III Science and Validation Objectives for …...Mission Status •Launched Dec 10, 2001...
Transcript of SAGE III Science and Validation Objectives for …...Mission Status •Launched Dec 10, 2001...
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C. Trepte, L. Poole, M. Pitts, L. Thomason, J. ZawodnyB. Pierce and L. Harvey
(NASA Langley Research Center)
SAGE III Science and Validation Objectives for SOLVE II
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SAGE III Instrument
scan mirror
solar attenuator
secondary mirror
primary mirror
diffraction grating
CCD
folding mirror
Launched 10 December 2001 on Russian Meteor-3m spacecraft
Based upon a UV/Visible spectrometer used to obtain profiles of O3, aerosol, H2O, NO2, NO3, OClO, and temperature with a vertical resolution of ~1 km.
New configuration includes:CCD linear array for measurements between 290
and 1020 nmPhotodiode for aerosol measurements at 1550 nmFused-silicate attenuator plate enables lunar,
solar, and limb-scattering observations
Heritage:Stratospheric Aerosol Measurement (SAM);
Apollo-Soyuz (1975)SAM II; Nimbus 7 (1978-1993)SAGE I; AEM-B (1979-1981)SAGE II; ERBS (1984-present)
SAGE III Instrument Schematic
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Science Data Products
Product Esitmated Precision
Altitude Range (km)
Aerosol Extinction (@385, 448, 521, 676, 756, 869,
1020, 1540 nm)5% 0-40
Aerosol Optical Depth (@ 521nm and longer)
5% N/A
Ozone Number Density 5% (Solar) 10%(Lunar)
6-85 16-35(Lunar)
NO2 Number Density 15% (Solar) 15%(Lunar)
10-50 19-37
H2O Number Density 15% 0-50OClO Number Density 25% (Lunar) 15-25NO3 Number Density 10% (Lunar) 10-55
Temperature and Pressure 2K 2%
0-85
Cloud Presence N/A 6-30
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Mission Status
• Launched Dec 10, 2001• First solar data (Feb 28)
Sunset measurements ~ 100% Sunrise measurements ~ 97%Aerosol, O3, and NO2 data to be archived ~ Dec 15
• First lunar data on (Mar 5) Approximately 80% Moonset data acquiredLimited Moonrise data acquired. Revising flight software to improve tracking
• Primary 1.7 GHz spacecraft transmitter failed (Jan 1)• Spacecraft GPS/GLOSNAS failed• Etalon problem with Solar Attenuator• First limb-scattering data (Sep 8)
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Validation/Science Objectives• Acquire correlative measurements
• determine relative biases between sensors• investigate impact of inhomogeneities
• Verify altitude registration• impact of clouds• variation of lunar albedo & disk illumination• new technique based on O2 O2
• Examine impact of attenuator correction procedure
• Examine T dependence of O3 cross-section in O2 A-band
• Support winter O3 loss studies (e.g, match campaign)
• PSC investigations
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SAGE III Measurement Sequence
Effective Center of
Brightness
∆ h
MeasurementPackets
Terminator
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Measurement Coverage
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Attenuator Plate Correction
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Attenuator Plate Correction
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Ozone SAGE III vs. SAGE II
SAGE III (V1.06):9-May-02 – 10-May-02Lat: 50.04oN to 50.56oN21 Profiles
SAGE II:9-May-02Lat: 52.11oN to 52.84oN5 Profiles
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NO2 SAGE III vs. SAGE II
SAGE III (V1.06):9-May-02Lat: 50.04oN to 50.56oN21 Profiles
SAGE II:9-May-02Lat: 52.11oN to 52.84oN5 Profiles
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Quicklook Productse.g., aerosol extinction 1020 nm
QL data available ~ 6 pm day of observation in Sweden
Complete Level 1 & 2 data set will be transfered
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Measurement Strategy
• Correlative measurements - along LOS (curtain observations)- perpendicular to LOS (slant path optical depth obs)- profile descent at satellite tangent location (in situ obs)
• Comparisons with SAGE III spectral survey
- SAGE event between 0 º - 40º W from Jan 30 - Feb 4
• Best moonset observation opportunity- Jan 25 or 26 over southern Scandinavia- local midnight
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‘Strawman’ Flight Strategy
Satellite LOS
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LaRC Forecast Support
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LaRC Forecast Support
Forecast trajectories along SAGE, POAM LOS
Reverse Domain Filling techniques
T, wind, PV, Mixing Efficiency, etc.
URL catalogue
DAO driven (48 - 84 hr)
350, 450, 550, and 700 K
available by 6 am in Kiruna